A storm began crawling across Saturn’s northern hemisphere in late 2010 and grew to gigantic proportions, encircling the planet before it dissipated two-thirds of a year later. This sequence of images showing the storm’s development “illustrates the value of being in orbit around a planet,” Porco says. The storm strangely resembled equivalents on Earth: It probably dumped rainfall of liquid water, Porco says, and Cassini’s cameras picked up flashes of lightning.